The Mueller-Kueps Universal Belt Wrench, No. 551 005, allows users to tighten the strap to the size needed to loosen an oil filter without denting the filter in the process. The band is made of nylon, enabling users to also use it to hold pulleys or rolls without damaging them. The tool features a 1/2" drive and is ideal for larger trucks and equipment with a filter size of up to 7” diameter. It's recommended by Caterpillar for use on their equipment, the company says.